Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02272986 1999-OS-20
11437.WCR
cm\F:\wORK\558\11437\spec\11437.wcr
INTEGRATED, FOLD-UPREFLECTOR BRACKETS
BACKGROUND OF THE INVENTION
1 1. Field of the Invention
The present invention relates generally to
integrated fold-up reflector mounting brackets to
mount a reflector to a lighting fixture or luminaire,
and more particularly pertains to integrated fold-up
reflector mounting brackets which are fabricated as an
integral part of the reflector of a lighting fixture
or luminaire during the production thereof without the
use of additional material, components and operations.
2. Discussion of the Prior Art
Reflectors are commonly mounted on or to a lighting
fixture or luminaire by the use of additional mounting
brackets which are secured to the reflector.
Alternatively, the direct mounting of an inexpensive
,reflector without additional mounting brackets
frequently causes thermal and optical problems, while
additional bracket systems add parts, costs and
installation steps to the resulting product.
SUN~,RY OF THE INVENTION
Accordingly, it is a primary object of the
present invention to provide integrated fold-up
reflector brackets to mount a reflector to a lighting
fixture or luminaire.
A further object of the subject invention is
the provision of fold-up reflector brackets which are
fabricated as an integral part of the reflector of a
lighting fixture or luminaire during the production
thereof without the use of additional material,
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components and operations, and which is particularly
1 applicable to spun aluminum reflectors and plastic
prismatic reflectors.
In accordance with the teachings herein, the
present invention provides a reflector for a lighting
fixture having first and second mounting brackets
fabricated as an integral part of the top of the
reflector. The top of the reflector is fabricated
with a stamping operation to provide an opening in the
top thereof to provide for the mounting of a lamp
socket and to allow for the flow of ventilation air
therethrough. First and second fold-up mounting
brackets are stamped and fabricated as an integral
part of the top of the reflector. Each of the first
and second fold-up brackets comprises a plurality of
contoured ribs, with at least one of the contoured
ribs having a truncation therein defined along a fold
line for the mounting bracket. After fold-up of the
mounting bracket along the fold line, the truncation
is positioned against an other surface of the mounting
bracket to enhance the rigidity of the deployed
mounting bracket structure, and an opening is cleared
in the top of the reflector.
In greater detail, in a first embodiment the
first and second mounting brackets are laid out in an
offset S pattern wherein the first and second mounting
brackets are positioned side by side across the top of
the reflector. In a second embodiment the first and
second mounting brackets are laid out in an opposed H
pattern wherein the first and second mounting brackets
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each extend toward the center of the top of the
1 reflector and each other.
In one embodiment, the top of the reflector
is an integral part of the reflector, which is
particularly applicable to reflectors spun from soft
aluminum. In a second embodiment, the top of the
reflector is a metal attaching system which is
attached to the reflector, which is particularly
applicable to plastic prismatic reflectors.
Each contoured rib is V shaped, and the
truncation is positioned at a 45° angle relative to
the longitudinal axis of the contoured rib. In one
embodiment, after fold-up, the truncation is
positioned flush against another contoured rib, and in
a second embodiment the truncation is positioned flush
against another truncation.
An access opening is provided adjacent to
each fold-up mounting bracket to provide access to
enable the bracket to be pryed to its fold-up
position.
In a first embodiment, each mounting bracket
comprises a plurality of parallel contoured ribs, and
a further end contoured rib extends perpendicular to
the ends of the parallel contoured ribs and provides
the surface against which the truncations of the
parallel ribs abut.
In a second embodiment, each mounting
bracket comprises a first center contoured rib and a
second contoured end rib laid out in a T pattern. The
first center rib defines a truncated end surface
adjacent to the center of the second end rib. After
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fold-up, the truncated end of the first center rib is
1 seated flush against the center of the second rib to
enhance the rigidity of the unfolded mounting bracket
structure.
In one alternative embodiment, the fold-up
line is formed by a pair ~f opposed truncations in
each rib, and after fold-up, the opposed truncations
are seated flush up against each other to enhance the
rigidity of the unfolded mounting bracket structure.
The present invention also provides a method
of fabricating first and second mounting brackets as
an integral part of the fabrication of the top of a
reflector for a lighting fixture. The top of the
reflector is fabricated with a stamping.operation to
provide an opening in the top which provides for the
mounting of a lamp socket therein and also allows for
the flow of ventilation air therethrough. During the
stamping operation, first and second fold-up mounting
brackets are stamped and defined as an integral part
of the top of the reflector. Each of the first and
second fold-up mounting brackets comprises a plurality
of contoured ribs, with at least one of the contoured
ribs having a truncation defined along a fold line.
After each bracket is folded-up along the fold line,
the truncation is positioned flush against an other
surface of the mounting bracket to enhance the
rigidity of the deployed mounting bracket structure,
and an opening is cleared in the top of the reflector.
In greater detail, the stamping operation
defines the contoured ribs as V shaped ribs, and also
provides a cut along the periphery of each mounting
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bracket. It also provides an access opening adjacent
1 to each fold-up mounting bracket to allow the mounting
bracket to be pryed to a fold-up position.
$RIEF DESCRIPTION OF THE DRAWINGS
The foregoing objects and advantages of the
present invention for integrated fold-up reflector
mounting brackets may be more readily understood by
one skilled in the art with reference being had to the
following detailed description of several preferred
e~odiments thereof, taken in conjunction with the
accompanying drawings wherein like elements are
designated by identical reference numerals throughout
the several views, and in which:
Figure 1 illustrates a top perspective view
of a reflector as used in a highbay ffixture which is
fabricated by being spun from very soft aluminum, and
shows the integrated fold-up reflector mounting
brackets of the present invention which are integrated
into the fabrication of the t.op of the reflector.
Figure 2 is an enlarged view of the
integrated fold-up reflector mounting brackets of
Figure 1.
Figures 3 and 4 are sectional views taken
through the mounting brackets of Figure 2, taken
respectively along directional arrows 3-3 and 4-4 in
Figure 2.
Figure S is a top perspective view of a
modification of the structure of Figure 2.
Figures 6 and 8 illustrate a further
embodiment of the present invention wherein the two
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fold-up reflector mounting brackets are arranged in an
1 opposed H pattern.
Figure 7 illustrates the fold-up mounting
brackets of the reflector of Figures 6 and 8
cooperating with and being received by a top bracket
of a lighting fixture, to provide a required
adjustment in length.
DETAILED DESCRIPTION OF THE DRAWINGS
The fabrication spun aluminum reflectors
Presently requires a secondary stamping operation in
the top of the reflector to provide an opening in the
top to enable the clearance of a lamp socket and lamp
and to provide for ventilation. The present invention
designs the reflector mounting brackets as an integral
part of the top of the spun reflector which are
fabricated during the secondary stamping operation, to
in essence provide a "free" fabrication of the
mounting brackets.
This technical approach can also be applied
to plastic prismatic reflectors by incorporating the
reflector mounting brackets into the metal attaching
system which is attached to the top of each plastic
reflector. In this instance, the reflector mounting
brackets are designed to be fabricated as an integral
part of the metal attaching system which is
subsequently attached to the plastic prismatic
reflector.
Two major problems are associated with this
concept and had to be addressed:
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1. Spun reflectors are made of very "soft"
1 aluminum which makes poor and weak brackets.
Moreover, since the customer normally assembles the
luminaire on the ground prior to hanging thereof, the
bracket system has to be strong enough to support the
heavy ballast module in a "standing" position on the
ground.
2. Various lamp sizes and light
technologies require the reflectors to be located
relatively far from the socket and to be adjustable in
order to accommodate different light centers and
distribution patterns. Additionally, the width at the
top of the reflector is relatively small and
represents a serious physical limitation.
There are two structural challenges
associated with the first problem.
1. the brackets had relatively poor
compression strength and bent easily, and
2. the connecting top surface would bend
downwardly under the heavy ballast load.
Both of these problems were addressed by the
present invention by designing a ribbing system into
the mounting brackets and connecting top surface. In
order to avoid using a weak, perforated scoring system
on the fold-up mounting brackets, a unique truncated,
rib design ensures folding at the desired location.
The cross section of the ribs are "V-shaped" and the
truncations are positioned along the bend line
location. The truncations are 45 degrees, and in the
fold-up configuration are seated flush up against an
end V-shaped rib or up against each other to reinforce
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the overall strength of the system in its fold-up
1 configuration.
The second problem was addressed with two
different design approaches:
1. In a first embodiment, the mounting
brackets are laid out in an off set "S" pattern to
achieve the required length in the brackets to
accommodate a vertical adjustment of the reflector.
This approach was designed to be used with a narrow,
vertical wall housing wherein the mounting brackets
can be adjusted up and down the side walls.
2. In a second embodiment, the mounting
brackets are laid out in an opposed "H" pattern, and
are used in conjunction with a separate additional
bracket to achieve the required length and
adjustability. The additional bracket is required for
two bracket systems wherein there is not enough room
above the top brackets to allow them to be adjusted
upwardly. Adjustments are achieved by linearly
displacing one mounting bracket relative to the second
bracket.
Both fold-up designs provide void areas
adjacent to the mounting brackets to allow fingers to
be inserted under the brackets to fold them up to
their deployed positions. Either design approach is
less expensive, requires less parts, and is easier to
install (mounting bracket attachment to the reflector
is eliminated) than prior art mounting bracket systems
it would replace. Additionally, since the mounting
bracket system is folded-up to a deployed position by
the customer, bulk package nesting is not affected.
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Figure 1 illustrates a top perspective view
1 of a reflector 10 as used in a highbay fixture which
is fabricated by being spun from very soft aluminum,
and shows the integrated fold-up mounting brackets 12,
14 pursuant to the teachings of the present invention.
Figures 3 and 4 are sectional views taken through the
mounting brackets of Figure 2, taken respectively
along directional arrows 3-3 and 4-4 in Figure 2.
The mounting brackets of Figure 1 are laid
out in an offset S pattern. A first of the mounting
brackets 12 is illustrated in the position in which it
is fabricated during the secondary stamping operation,
while the second of the mounting brackets 14 is
illustrated in its deployed, fold-up position. Each
of the first and second fold-up mounting brackets has
a plurality of V shaped ribs 16 with truncations 18
being defined in each rib at a bend-up location or
line 20. A finger access depression 22 is defined
adjacent to each mounting bracket to enable an
installer to pry up each mounting bracket to its fold-
up deployed position, with each bracket pivoting along
its respective truncated fold line 20, as illustrated
by the fold-up arrow 24 of Figure 1. After folding
and deployment, the triangular truncated surfaces 18
come into direct contact with an end V shaped rib 26
to enhance the rigidity of the deployed assembly.
Figure 5 is a top perspective view of a
modification of the structure of Figure 2 in which a
fold-up line 50 is formed by a pair of opposed
truncations 52 in each rib, such that in the fold-up
configuration, the opposed truncations 52 are seated
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flush up against each other to reinforce the strength
1 of the structure.
Figures 6 through 8 illustrate a further
embodiment of the present invention wherein the
reflector comprises a plastic prismatic reflector 60
having a top metal attachment 62 secured to the top of
the plastic prismatic reflector 60, and the mounting
brackets 64 are formed as an integral part of the top
metal attachment 62. In this embodiment, the two
mounting brackets 64 are arranged in an opposed H
Pattern. As illustrated in Figure 8, each mounting
bracket 64 is formed by first and second V shaped ribs
66, 68 which are arranged in a T shape relative to
each other. The first center V shaped rib 66 defines
a truncated 45° end surface 70 adjacent to the center
of the second rib 68, such that after each mounting
bracket is folded into an upright position, as
illustrated in Figure 6, the truncated end 70 of the
first center rib 66 rests flush against the center of
the second rib 68 to enhance the rigidity of the
unfolded mounting bracket structure.
As illustrated in Figure 7, each fold-up
mounting bracket 64 of the reflector of Figures 6 and
8 cooperates with and is received by a corresponding
top bracket 70 of the lighting~fixture, to provide a
required adjustment in length, wherein the adjustment
is achieved by linearly sliding each lower mounting
bracket 64 relative to each top bracket 70.
While several embodiments and variations of
the present invention for integrated fold-up reflector
mounting brackets are described in detail herein, it
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should be apparent that the disclosure and teachings
of the present invention will suggest many alternative
designs to those skilled in the art.
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